register api calls when web3 ready

lib/modules/whisper/index.js

@@ -15,6 +15,7 @@ class Whisper {
     this.communicationConfig = embark.config.communicationConfig;
     this.web3 = new Web3();
     this.embark = embark;
+    this.web3Ready = false;
 
     if (!this.communicationConfig.enabled) {
       return;
@@ -24,6 +25,9 @@ class Whisper {
     this.setServiceCheck();
     this.addWhisperToEmbarkJS();
     this.addSetProvider();
+    this.waitForWeb3Ready(() => {
+      this.registerAPICalls();
+    });
   }
 
   connectToProvider() {
@@ -32,6 +36,17 @@ class Whisper {
     this.web3.setProvider(new Web3.providers.WebsocketProvider(web3Endpoint, {headers: {Origin: "embark"}}));
   }
 
+  waitForWeb3Ready(cb) {
+    if (this.web3Ready) {
+      return cb();
+    }
+    if (this.web3.currentProvider.connection.readyState !== 1) {
+      return setTimeout(this.waitForWeb3Ready.bind(this, cb), 50);
+    }
+    this.web3Ready = true;
+    cb();
+  }
+
   setServiceCheck() {
     const self = this;
     self.events.request("services:register", 'Whisper', function(cb) {
@@ -43,7 +58,6 @@ class Whisper {
         if (err || version === "2") {
           return cb({name: 'Whisper', status: 'off'});
         } else {
-          self.registerAPICalls();
           return cb({name: 'Whisper (version ' + version + ')', status: 'on'});
         }
       });